Not on purpose. Sometimes my girls get too close and I get a whiff but not because I want to. There can be a reason to do it, stinky breath can be a sign of a health issue. So either she's keeping an eye on their health or she needs a new hobby. Did you try asking her why she does it?

This is actually a smart thing to do, once in a while. You cann tell if your cat may have a mouth infection. If your cat's breath smells "sweet" it may be a sign of diabetes and you should have your pet tested.